Well still did it but only 1/2 as long this morning about 4 miles, temp outside was 30 degrees. Mine only seems to do it under 33 to 32 degrees. Is yours only a few miles or is it constant? I know when it is 1/2 shut my egt's are 100 to 150 higher than normal around 650 to 700 and have no boost at all, my hpop pressure is around 1500 to 1800 at 1/4 throttle. I go to about 3/4 throttle and the ebps sensor senses I have too much back pressure and it opens the valve all the way and my boost jumps up instantly to 5 to 7 psi and my egt's go back to 500 to 550. But as soon as I ease up on the throttle it starts shutting again and no boost and higher egt's and hissing. I go back and forth about 5 or 6 times in about 5 miles or so and it finally stays open. So I am still kind of lost on what else it could be unless my ebps has enough carbon in it to only sense very high back pressure maybe? I'll keep working on it to try and figure it out.
-Jay

That sounds like mine.. Does yours kinda bog down a little too when you hear that noise? I havent notice any change in mine egt wise but thats probably cause i wasnt really looking at them.. I only get the noise when it is freezing out (20's) so i dunno what it is

Yes you have a power loss because you have no boost, trying to suck through the turbo for the most part. That's why most people delete it because of the big drop in mileage and power when the valve sticks 1/2 shut. I ordered a new ebps today after I got home and will be in tomorrow to see if the sensor is the prob. Sucks its 120 bucks though. I never had a problem at all with this truck( just got it 5 months ago) until I power washed the engine because the guy I got it from lived on a dirt road. So I feel like an idiot thinking that I messed it up even though I'm sure it's unrelated. Either way I'm going to get it figured out one way or another I'll post what happens Friday sometime if its cold enough in the morning.
-Jay

Yes, but none of them are the same and you have to pull the pedestal the gut it or change the pedestal, and from the sounds of things you get codes and some codes will de-fuel. I'm a big fan of keeping things they way they should be. Also I work with a 20+ year diesel mech and he was explaining how the valve puts a fake load on the engine pre turbo to heat up the pistons to swell faster so you don't have the blow by and carbon build up on the rings. Thats why you feel no power because your turbo is only getting 1/2 the exhaust pressure and the engine is working harder with the added load on it.( making more heat faster ) Cold high idle with no valve will take longer to heat up and could down the road lead to excessive blow by that just starts compounding things. Worst thing you can do to a diesel is idle because of the wash down affect, this valve is just another measure to prevent it, but you can find a bunch of threads on how " I just cut the wires and gain 50 horse and get 35mpg's now! " a lot of these people don't understand how these engines work and are keyboard mechanics so I take a lot of these threads with a grain of salt.
-Jay

its kind of a pain because you need to get behind the turbo on the downpipe side thats where the valve is, i took mine off when i took the turbo off thats the easiest way, take the turbine housing off (exhaust side) i had to stuff a rag in the turbo to keep the metal shavings from going in it but drilled out the rivots, removed snap ring and seal then pulled (beat) the valve stem out and I welded a bolt in where the valve stem was, put the seal and snapring back in, reinstall housing and then reinstall turbo, replace o-rings on top of the pedestal and your done.

mine doesn't take that long to heat up, but i also did the hi idle mod. as far as building up carbon on the rings, i would buy that if you idled for 10hours straight, but your talking about a warm up time, then your on the pedal, doubt theres any carbon buildup but i'm no expert.

Well put the new ebp sensor last night but i don't think it got cold enough to make it do it, or it worked one or the other. it was around 35 degrees this morning so thinking it was that. either way i will post more results when it drops below freezing again.
-Jay

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